...they're reaching for the light, that's a good thing! I often walk into my room minutes before the light comes on just to see my ladies standing tall, they typically level out once the light comes on though......what kind of light are you using?
...actually, no they don't.....your plants will grow in a veg state when they are under 24/0 light, grow and grow and grow....theoretically forever, but won't flower until they get long sleep daily.....I've been running my veg 24/0 for quite some time.
...what are your room temps, lights-on/lights-off?
...could be your problem.
....5 GALLONS WITH NUTES PHOSHORUS? WTF??? ....awe, I've got a bad feeling about this one...that's just, just, TOO MUCH...hahahahaha! Sorry, it isn't funny, I know....but DAMN!
...sounds and definately looks like...
...if ya do decide to add a heater into your room, I'd suggest an oil filled heater, they're pretty fire safe.
...here's a link to get a visual and additional info --->...
....80 degrees F is a rather high temp for sleep hours....I've experienced something like what you speak of, not for certain if it was the "exact" issue, but high temps seemed to be the culprit in my situation. The roots needed to cool down....something to consider. Good luck bro.